/Engine/Plugins/Editor/UVEditor/Source/UVEditorTools/Public/ContextObjects/UVToolContextObjects.h
Broadcast by the 3D live preview viewport on DrawHUD() so that mechanics/tools can draw there.
typedef TMulticastDelegate_TwoParams< void, [FCanvas](API\Runtime\Engine\FCanvas) *Canvas, [IToolsContextRenderAPI](API\Runtime\InteractiveToolsFramework\IToolsContextRenderAPI) *RenderAPI > FOnDrawHUD